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Thread: Location of Bathroom Vent outlet

  1. #1
    DIY Senior Member rdtompki's Avatar
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    Default Location of Bathroom Vent outlet

    I'm remodeling a large master bath (225 sq. ft.) and although the bathroom has 3 windows I'm still opting for a 250 cfm remote vent fan with two ceiling inlets. I'm trying to avoid going through the roof with the vent, but I believe that code requires the outlet to be a minimum of 10' from any window or attic vent. With a shallow roof and three windows it's going to be mighty hard to find a place on the gable end of the house. Anyone have experience with this sort of problem? I am doing this work with a permit so I will also try giving the inspector a call. Seems a bit silly to worry about the windows since the reason I'm installing the ventilation is that we seldom open are windows!

    Worst call I'll call a roofer and get a roof jack (is that what it is called?) installed. I could probably do this myself, but I don't want any leaks.

  2. #2
    DIY Senior Member finnegan's Avatar
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    There are restrictions on the locations where you can terminate a DWV vent pipe that include clearances from openable windows and other intakes. Though, I am not familiar with anything that would restrict the location of a bath fan vent outlet.

  3. #3

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    I agree with Finnegan. The drain vent restrictions are to prevent discharging noxious gas near where people could be. The exhaust vent discharges largely moisture, and I imagine the restrictions are the same as that of dryer and oven vents. My dryer discharges right next to my door, so I infer there's no restriction.
    (important note: I'm not a pro)

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    Through the roof is always better.
    Anywhere on the roof, if it's higher than the windows is ok.
    The 10' limit is for vents terminated below the roof.

  5. #5
    DIY Senior Member rdtompki's Avatar
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    Thanks for the replies. Since I've to good access to the attic and a shallow roof I'll opt for the roof jack. This will somewhat simplify routing the vent duct.

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